First round of dead file removal

experimental/conways_life/threading/condition_lock.h

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONDITION_LOCK_H_
-#define CONDITION_LOCK_H_
-
-#include <pthread.h>
-
-namespace threading {
-// Class to manage a lock associated with a specific value.  The calling thread
-// can ask to acquire the lock only when the lock is in a certain condition.
-class ConditionLock {
- public:
-  ConditionLock() : condition_value_(0) {
-    InitLock();
-  }
-  explicit ConditionLock(int32_t condition_value)
-      : condition_value_(condition_value) {
-    InitLock();
-  }
-
-  virtual ~ConditionLock() {
-    pthread_cond_destroy(&condition_condition_);
-    pthread_mutex_destroy(&condition_lock_);
-  }
-
-  // Acquire the mutex without regard to the condition.
-  void Lock() {
-    pthread_mutex_lock(&condition_lock_);
-  }
-
-  // Acquire the mutex lock when the lock values are equal.  Blocks the
-  // calling thread until the lock can be acquired and the condition is met.
-  void LockWhenCondition(int32_t condition_value) {
-    Lock();
-    while (condition_value != condition_value_) {
-      pthread_cond_wait(&condition_condition_, &condition_lock_);
-    }
-    // When this method returns, |contition_lock_| will be acquired.  The
-    // calling thread must unlock it.
-  }
-
-  // Acquire the mutex lock when the lock values are _NOT_ equal.  Blocks the
-  // calling thread until the lock can be acquired and the condition is met.
-  void LockWhenNotCondition(int32_t condition_value) {
-    Lock();
-    while (condition_value == condition_value_) {
-      pthread_cond_wait(&condition_condition_, &condition_lock_);
-    }
-    // When this method returns, |contition_lock_| will be acquired.  The
-    // calling thread must unlock it.
-  }
-
-  // Release the lock without changing the condition.  Signal the condition
-  // so that threads waiting in LockWhenCondtion() will wake up.  If there are
-  // no threads waiting for the signal, this has the same effect as a simple
-  // mutex unlock.
-  void Unlock() {
-    pthread_cond_broadcast(&condition_condition_);
-    pthread_mutex_unlock(&condition_lock_);
-  }
-
-  // Release the lock, setting the condition's value.  This assumes that
-  // |condition_lock_| has been acquired.
-  void UnlockWithCondition(unsigned int condition_value) {
-    condition_value_ = condition_value;
-    Unlock();
-  }
-
-  // Return the current condition value without any mutex protection.
-  int32_t condition_value() const {
-    return condition_value_;
-  }
-
- private:
-  void InitLock() {
-    pthread_mutex_init(&condition_lock_, NULL);
-    pthread_cond_init(&condition_condition_, NULL);
-  }
-
-  pthread_mutex_t condition_lock_;
-  pthread_cond_t condition_condition_;
-  int32_t condition_value_;
-};
-}  // namespace threading
-
-#endif  // CONDITION_LOCK_H_